🅁🄴🅅🄸🄴🅆 🅃🄾🄿🄸🄲🅂 : 𝗛𝘂𝗺𝗮𝗻 𝗣𝗼𝗽𝘂𝗹𝗮𝘁𝗶𝗼𝗻 & 𝗘𝗮𝗿𝘁𝗵’𝘀 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 👤🌍
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ᗪEᗰOGᖇᗩᑭᕼIᑕ TᖇᗩᑎᔕITIOᑎ: the demographic transition will be affiliated with at least one question on the APES examination. It has shown up on the extended response section in recent years as well.📚
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It’s important to note that as a country is progressing through the stages of the transition, it is becoming 𝙈𝙊𝙍𝙀 developed. 📟
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Stages 🅾🅽🅴 (the first stage) and 🅵🅾🆄🆁 (the last stage) generally are relatively stable. Stage four may eventually begin to experience decline. 〰️
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Stage 🆃🆆🅾 experiences high birth rates, but a decreased death rate. This occurs because medicine and sanitation are improved, thereby decreasing 𝙞𝙣𝙛𝙖𝙣𝙩 𝙢𝙤𝙧𝙩𝙖𝙡𝙞𝙩𝙮 𝙧𝙖𝙩𝙚𝙨 👶🏻
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Stage 🆃🅷🆁🅴🅴 undergoes a decreased birth rate and the same lowered death rate. This is because the country has improved 𝙚𝙙𝙪𝙘𝙖𝙩𝙞𝙤𝙣 and is implementing 𝙗𝙞𝙧𝙩𝙝 𝙘𝙤𝙣𝙩𝙧𝙤𝙡 techniques. People are transitioning towards 𝙛𝙖𝙢𝙞𝙡𝙮 𝙥𝙡𝙖𝙣𝙣𝙞𝙣𝙜. 👨‍👩‍👦‍👦
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Here’s the trends summarized:
* Stage 1: High Birth, High Death
* Stage 2: High Birth, Low Death
* Stage 3: Low Birth, Low Death
* Stage 4: Low Birth, Low Death
* (Stabilities at stages 1 and 4)
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ᗩTᗰOᔕᑭᕼEᖇE ᒪᗩYEᖇᔕ: this is a topic that is likely to be on a set of matching questions in the beginning of the exam, it’s important to know their order and characteristics ☁️
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Order (bottom up)
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𝐓𝐫𝐨𝐩𝐨𝐬𝐩𝐡𝐞𝐫𝐞: earth’s daily weather
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𝐒𝐭𝐫𝐚𝐭𝐨𝐬𝐩𝐡𝐞𝐫𝐞: ozone blocks UV-B and UV-C light; temperature 𝗜𝗻𝗰𝗿𝗲𝗮𝘀𝗲𝘀 as you go up in the stratosphere (unusual trend)
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𝐌𝐞𝐬𝐨𝐬𝐩𝐡𝐞𝐫𝐞: 50-80 km above earth’s surface
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𝐓𝐡𝐞𝐫𝐦𝐨𝐬𝐩𝐡𝐞𝐫𝐞: where molecules begin to break apart into ions; is often clumped with the upper mesosphere to be called the 𝗜𝗼𝗻𝗼𝘀𝗽𝗵𝗲𝗿𝗲. **
𝐄𝐱𝐨𝐬𝐩𝐡𝐞𝐫𝐞: the uppermost layer in the atmosphere
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#apenvironmentalscience#environmentalscience#science#APreview#APESreview#atmospherelayers#sciencereview#collegeboard#APexam#humanpopulation#APscience#recent4recent#like#tysfollowtrain

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